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Computation of Net Loss per Common Share - Reconciliation of Numerators and Denominators of EPS Calculation (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Numerator:        
Net loss $ (4,248) $ (2,768) $ (26,782) $ (20,448)
Denominator:        
Weighted-average shares of common stock outstanding (in shares) 20,889 14,203 19,189 14,175
Weighted-average shares subject to repurchase (in shares) (940) (411) (575) (429)
Shares used in per-share calculation ― basic (in shares) 19,949 13,792 18,614 13,746
Shares used in per-share calculation ― diluted (in shares) 19,949 13,792 18,614 13,746
Net loss per share ― basic (in dollars per share) $ (0.21) $ (0.20) $ (1.44) $ (1.49)
Net loss per share ― diluted (in dollars per share) $ (0.21) $ (0.20) $ (1.44) $ (1.49)